Investigating the influence of roughness length for heat transport (zoh) on the performance of SEBAL in semi-arid irrigated and dryland agricultural systems

George Paul, Prasanna H. Gowda, P. V. Vara Prasad, Terry A. Howell, Robert M. Aiken, Christopher M.U. Neale

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Satellite-based thermal infrared remote sensing has greatly contributed to the development and improvement of remote sensing-based evapotranspiration (RS-ET) mapping algorithms. Radiometric temperature (Ts) derived from thermal sensors is inherently different from the aerodynamic temperature (To) required for solving the bulk formulation of sensible heat (H). The scalar roughness length (zoh) representing heat transport mechanism and described by the dimensionless parameter kB-1 was used to account for the discrepancy between Ts and To. Surface Energy Balance Algorithm for Land (SEBAL), with its indigenous approach of linearly relating dT (near-surface temperature gradient) with Ts across the imagery, maintained that this approach would absorb the impacts of differences between Ts and To. Therefore, it utilized a constant kB-1 value of 2.3 in its initial version, and later switched to a constant zoh (z1) value of 0.1. In this study, we investigated the influence of these changes in SEBAL by testing four different approaches: (i) zoh derived from a constant kB-1 of 2.3, (ii) constant zoh (z1)=0.1m, (iii) constant zoh (z1)=0.01m, and (iv) spatially variable zoh from kB-1 parameterization. SEBAL was applied on 10 high-resolution airborne images acquired during BEAREX07-08 (Bushland Evapotranspiration and Agricultural Remote Sensing Experiment) and validated against measurements from four large weighing lysimeters installed on two irrigated and two dryland fields. The spatially variable kB-1 produced statistically different and improved ET estimates compared to that with constant kB-1 and constant z1 (zoh) approaches. SEBAL performance for irrigated fields representing high ET and complete ground cover surfaces was markedly different from that for dryland fields representing greater soil water deficits with sparser vegetation cover. A variable kB-1 value derived from a physical model generated good overall estimates while delivering improved performance for dryland agricultural systems. Overall, this study focused on the classical problem of estimating heat transfer from two contrasting hydrological regimes i.e. irrigated and dryland agriculture and illustrated the existing need for a realistic consideration of excess resistance to heat transfer in single-source resistance modeling frameworks.

Original languageEnglish (US)
Pages (from-to)231-244
Number of pages14
JournalJournal of Hydrology
Volume509
DOIs
StatePublished - Feb 13 2014
Externally publishedYes

Keywords

  • Aerodynamic temperature
  • Airborne Remote Sensing
  • Lysimeter
  • Roughness length sensitivity
  • SEBAL

ASJC Scopus subject areas

  • Water Science and Technology

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